OR, it's exactly what they've said in various communications over the last month or so.
They tweaked the formula, they are in production of the FOUR flavors, and until they have all four flavors on the shelf, ready to sell, there is nothing to announce.
AND NO, I don't think they have a date on when that will be done. They are not in control of production, so they don't know when it will be complete.
I do think that when production is complete, cans of all 4 flavors on the shelf, THAT IS WHEN it would be appropriate to do a PR, and not before.